Just pip install setuptools on AppVeyor

Use the get-pip script to bootstrap pip and setuptools to pinned
versions for Python 3.2 compatibility.

PyPy3's latest Windows version only supports Python 3.2, so while Python
3.2 is EOL upstream, we're still testing against it and need to be able
to install our tooling (including pip and setuptools).

Author: jaraco

.appveyor.yml

@@ -30,13 +30,11 @@ install:
 
   # pypy3-2.4.0 and pypy-2.6.1 are manually bootstrapped and tested
   - ps: (New-Object Net.WebClient).DownloadFile('https://bootstrap.pypa.io/get-pip.py', "$env:appveyor_build_folder\get-pip.py")
-  - git clone https://github.com/pypa/setuptools/
-  - cd setuptools
-  - C:\pypy3-2.4.0-win32\pypy3 bootstrap.py
-  - C:\pypy3-2.4.0-win32\pypy3 setup.py install
-  - C:\pypy-2.6.1-win32\pypy bootstrap.py
-  - C:\pypy-2.6.1-win32\pypy setup.py install
-  - cd ..
+  # errors are ignored due to https://github.com/pypa/pip/issues/2669#issuecomment-136405390
+  # NOTE: If and when a new version of PyPy3 is released for Windows that
+  #       supports anything newer than Python 3.2, remove the setuptools pin.
+  - ps: C:\pypy3-2.4.0-win32\pypy3 "$env:appveyor_build_folder\get-pip.py"; C:\pypy3-2.4.0-win32\pypy3 -m pip install -U --force-reinstall pip==8.1.2 "setuptools<30"; echo "ignore error"
+  - ps: C:\pypy-2.6.1-win32\pypy "$env:appveyor_build_folder\get-pip.py"
 
 build: off